Stamp



FIG. 1 is a top, front right side perspective view of the stamp showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines illustrate environmental structure and form no part of the claimed design. 

The ornamental design for a stamp, as shown and described. 